98 burban, 5.3., TBI. came in for an intake gasket. tried to leave...but owner and we (the shop) feel it has a lack of power (drive) after we touched it. we have re-done the intake 3 TIMES...3rd time we did it by the book. have replaced new sparks, spark wires, cap, rotor. We tried a new EGR solenoid valve...no change. New MAP sensor... to no avail. New O2 sensor. ALL connections (sensors, wiring harness) are connected. Timing is correct (0 degrees) and is advancing properly (10 degrees + with RPM). once, a sulphur smell came from tailpipe...went away. also in park, or under heavy load, SOME black smoke comes from Tailpipe. Drilled "speedholes" (shop joke) in tailpipe before cat. conv...gave a very slight increase in power. We thought that cat. conv. is choked. Now it's thought that the EGR valve is bad. Oil is clean, and it could use a slight amt of ATF. NOT THROWING CODE
I personally (as well as the shop) would very much appreciate a viable solution to get this POS out of our bay.
2006-07-01
05:31:21
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4 answers
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asked by
Ryan
4
in
Chevrolet